Killer twisters likely among largest, strongest

Some of the killer tornadoes that ripped across the South may have been among the largest and most powerful ever recorded, experts suggested, leaving a death toll that is approaching that of a tragic "super outbreak" of storms ...

Knuckleball machine delivers soccer science

Wind tunnel and high-speed camera data help researchers to explore the zigzag secrets of one of football's most unpredictable shots and provide clues to much older scientific mysteries

A pool at Yellowstone is a thumping thermometer

While the crowds swarm around Old Faithful to wait for its next eruption, a little pool just north of Yellowstone National Park's most famous geyser is quietly showing off its own unique activity, also at more-or-less regular ...

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